Selenium is a trace mineral found naturally in the soil, water, and in certain (mostly whole) foods, including Brazil nuts, tuna, and eggs. An essential mineral, our bodies need selenium to properly function. Because our bodies do not make selenium, we must get it through diet. Though we only need small amounts of this mineral, it plays an important role in several bodily processes, including metabolism and thyroid function. Selenium is also necessary to make proteins that help the cells function and, as an antioxidant, it can help protect cells against harmful free radicals and repair damaged cells.
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